Emergency safety brake



1936- J. L. LOEHNIS ET AL. 2,062,184

EMERGENCY SAFETY BRAKE OriginalFiled April 16, 1929 LUVENTOHS Wesley I. mll iama a JEzIzn Z- Zoehm's.

ATTORNEY.

Patented Nov. 24, 1936' UNITED STATES PATENT OFFICE EMERGENCY SAFETY BRAKE John L. Loehnis, Long Beach, and Wesley I. Williams, Wilmington, Calif.

Refiled for abandoned application Serial No. 355,442, April 16, 1929. This application April 20, 1936, Serial No. 75,428

2 Claims.

This is a new application filed in place of our abandoned application, Ser. No. 355,442, filed April 16, 1929 for Emergency safety brake.

This invention relates to an emergency safety brake appliance whereby the wheels of a conveyance such as street cars, railroad cars, and the like, are effectively stopped, particularly upon a slippery or inclined track.

An object of our invention is to provide an emergency safety brake which can be quickly and easily placed under the wheels of the conveyance to bring said conveyance to a quick stop.

A further object is to provide a brake of the character stated which is simple in construction and effective in operation.

Other objects, advantages, and features of invention may appear from the accompanying drawing, the subjoined detailed description, and the appended claims.

In the drawing Figure 1 is a side elevation of our safety brake shown in position on the trucks of a conveyance.

Figure 2 is an enlarged fragmentary side elevation of our safety brake in position on the truck of a conveyance.

Figure 3 is a plan view of the shoe.

Referring more particularly to the drawing, the numeral I indicates the truck structure of a conveyance upon which the front and rear sets of wheels 2, 3 are journaled. The sets of wheels 2, 3 are mounted upon shafts 4, 5, respectively, and sprocket wheels 6, I are secured to the shafts 4, 5, respectively. A chain 8 encircles the sprockets 6, 1, the purpose of this chain being to communicate the braking action on the front wheels to the rear set of wheels, as will be further described. The wheels 2, 3 travel upon the rails 9, all of which is usual and well known in this type of construction.

The braking shoe I0 is suspended forwardly of the wheel 2 and this shoe is adapted to move forwardly or rearwardly, as will be further described. The rear face of the shoe I0 is arcuate, as shown at H, so that it will fit the periphery of the wheel 2. The lower face of the shoe [0 is a plane horizontal surface, as Shown at l2, so that it may rest upon the rail 9.

A serrated or toothed roller [3 is journaled in an opening I4 in the shoe II], this roller being adapted to bear against both the periphery of the wheel and the upper surface of the rail 9. This serrated roller acts as an idler gear between the wheel and the rail and tends to move the wheel in a reverse direction to its normal forward rotation. Thus, a very effective braking action is had upon the wheel.

A strap I5 rises from the shoe l0 and a bar l6 extends thru the strap and thru the truck frame structure I. A spring I! bears against a nut I8 on the top of the bar IS. The purpose of this spring is to hold the shoe up out of contact with the rail 9 when the shoe is not in braking position. This latter arrangement is shown in Fig. 1.

The shoe i0 is moved rearwardly into contact with the wheel 2 by any suitable manual or mechanical means, the means here shown consisting of a link l9 which is pivotally secured to the shoe I0 and to a lever which is pivotally mounted upon the frame I. The lever 20 may be either manually or mechanically moved to swing the shoe I 0 under the wheel 2 into the position shown in Fig. 2.

Having described our invention, we claim:

1. An emergency brake appliance for rail conveyances including a truck frame, wheels journaled on the truck, and rails upon which the wheels travel, said appliance comprising a shoe, an arcuate surface on the shoe adapted to be positioned adjacent the wheel in the operative position of the brake appliance, a rod secured to the shoe and extending thru the truck frame, a nut on said rod, a spring between said nut and the truck frame, a lever pivotally mounted on the frame, a link pivoted to the lever and the shoe whereby said shoe is moved into engagement with the wheel and track, and a toothed roller journaled on the shoe, said roller being adapted to contact with the wheel and rail, and the bottom surface of said shoe being on the rail when the brake appliance is operating.

2. An emergency safety brake appliance for rail conveyances including a truck frame, wheels journaled on the truck and rails upon which the wheels travel, said appliance comprising a shoe, an arcuate surface on the shoe adapted to be positioned adjacent the wheel in the operative position of the brake appliance, a strap rising from the shoe, a rod extending thru the strap and thru the frame, a spring engaging the rod and urging the same upwardly whereby the shoe is raised above the rail, a toothed roller journaled in the shoe and adapted to engage both the wheel and rail, and means whereby the shoe is moved into engagement with the wheel, and the bottom surface of said shoe being on the rail when the brake appliance is operating.

JOHN L. LOEHNIS. WESLEY I. WILLIAMS. 

